I have mixed feelings about this "influencers" phenomenon. On one hand, one might say these people really don't add any value to one's life and as a result, we should design mechanisms that rids the social media of such phenomenon.
On the other hand, in a free market/world people are free to do whatever they want and follow whomever they find interesting. So, maybe it's just another "phase" of human evolution in the bigger scheme of things; one that should be experienced by a few generations in order for them to really realize what's important and what's not.
Ask yourself this: how were all these foods invented thousands of years ago? People probably died of suddenly eating something they were not supposed to consume, and through trial-and-error, they finally realized what's healthy for them and what's not. The "Influencers" thing is just like that, only this time it deals with peoples' minds rather than their bodies.